From b490edb0399835eb26ed19d828e87f60c492690d Mon Sep 17 00:00:00 2001 From: helloworld <1878776550@qq.com> Date: Sat, 2 Dec 2023 23:19:49 +0800 Subject: [PATCH] =?UTF-8?q?=E5=9C=A8=E4=BB=A3=E7=A0=81=E4=B8=AD=E7=BB=99?= =?UTF-8?q?=E5=87=BA=E4=BA=86=E6=B3=A8=E9=87=8A?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- src/data/Contact.java | 13 ++- src/data/Notes.java | 169 ++++++++++++++++-------------- src/data/NotesDatabaseHelper.java | 153 ++++++++++++++------------- src/data/NotesProvider.java | 93 ++++++++++------ 4 files changed, 243 insertions(+), 185 deletions(-) diff --git a/src/data/Contact.java b/src/data/Contact.java index d97ac5d..41e5e71 100644 --- a/src/data/Contact.java +++ b/src/data/Contact.java @@ -26,9 +26,12 @@ import android.util.Log; import java.util.HashMap; public class Contact { + // 联系人缓存，用于存储已查询过的联系人信息 private static HashMap sContactCache; private static final String TAG = "Contact"; + // 查询联系人的条件语句，使用PHONE_NUMBERS_EQUAL函数进行号码匹配 + // 并且限定数据类型为电话号码，同时要求所属的RAW_CONTACT_ID在phone_lookup表中min_match字段为'+'的记录中 private static final String CALLER_ID_SELECTION = "PHONE_NUMBERS_EQUAL(" + Phone.NUMBER + ",?) AND " + Data.MIMETYPE + "='" + Phone.CONTENT_ITEM_TYPE + "'" + " AND " + Data.RAW_CONTACT_ID + " IN " @@ -36,27 +39,35 @@ public class Contact { + " FROM phone_lookup" + " WHERE min_match = '+')"; + // 获取联系人信息的方法 public static String getContact(Context context, String phoneNumber) { + // 如果联系人缓存为空，则创建一个新的HashMap对象 if(sContactCache == null) { sContactCache = new HashMap(); } + // 如果联系人缓存中已存在该号码对应的联系人信息，则直接返回缓存中的信息 if(sContactCache.containsKey(phoneNumber)) { return sContactCache.get(phoneNumber); } + // 使用PhoneNumberUtils工具类将给定的号码转换为标准化的号码 String selection = CALLER_ID_SELECTION.replace("+", PhoneNumberUtils.toCallerIDMinMatch(phoneNumber)); + + // 查询联系人信息 Cursor cursor = context.getContentResolver().query( Data.CONTENT_URI, - new String [] { Phone.DISPLAY_NAME }, + new String[] { Phone.DISPLAY_NAME }, selection, new String[] { phoneNumber }, null); + // 如果查询结果不为空且有数据，则处理结果并返回联系人姓名 if (cursor != null && cursor.moveToFirst()) { try { String name = cursor.getString(0); + // 将查询到的联系人信息存入缓存中 sContactCache.put(phoneNumber, name); return name; } catch (IndexOutOfBoundsException e) { diff --git a/src/data/Notes.java b/src/data/Notes.java index f240604..4278425 100644 --- a/src/data/Notes.java +++ b/src/data/Notes.java @@ -17,234 +17,246 @@ package net.micode.notes.data; import android.net.Uri; + public class Notes { + // 常量：ContentProvider的authority public static final String AUTHORITY = "micode_notes"; + // 常量：日志输出时的tag public static final String TAG = "Notes"; + // 常量：笔记类型 public static final int TYPE_NOTE = 0; + // 常量：文件夹类型 public static final int TYPE_FOLDER = 1; + // 常量：系统类型 public static final int TYPE_SYSTEM = 2; /** - * Following IDs are system folders' identifiers - * {@link Notes#ID_ROOT_FOLDER } is default folder - * {@link Notes#ID_TEMPARAY_FOLDER } is for notes belonging no folder - * {@link Notes#ID_CALL_RECORD_FOLDER} is to store call records + * 以下常量是系统文件夹的标识符 + * {@link Notes#ID_ROOT_FOLDER} 是默认文件夹 + * {@link Notes#ID_TEMPARAY_FOLDER} 是为不属于任何文件夹的笔记准备的 + * {@link Notes#ID_CALL_RECORD_FOLDER} 用于存储通话记录 */ public static final int ID_ROOT_FOLDER = 0; public static final int ID_TEMPARAY_FOLDER = -1; public static final int ID_CALL_RECORD_FOLDER = -2; public static final int ID_TRASH_FOLER = -3; + // 常量：intent传递的提醒日期extra的key public static final String INTENT_EXTRA_ALERT_DATE = "net.micode.notes.alert_date"; + // 常量：intent传递的背景颜色id extra的key public static final String INTENT_EXTRA_BACKGROUND_ID = "net.micode.notes.background_color_id"; + // 常量：intent传递的widget id extra的key public static final String INTENT_EXTRA_WIDGET_ID = "net.micode.notes.widget_id"; + // 常量：intent传递的widget type extra的key public static final String INTENT_EXTRA_WIDGET_TYPE = "net.micode.notes.widget_type"; + // 常量：intent传递的文件夹id extra的key public static final String INTENT_EXTRA_FOLDER_ID = "net.micode.notes.folder_id"; + // 常量：intent传递的通话日期extra的key public static final String INTENT_EXTRA_CALL_DATE = "net.micode.notes.call_date"; - public static final int TYPE_WIDGET_INVALIDE = -1; - public static final int TYPE_WIDGET_2X = 0; - public static final int TYPE_WIDGET_4X = 1; + // 常量：无效的widget类型 + public static final int TYPE_WIDGET_INVALIDE = -1; + // 常量：2x2的widget类型 + public static final int TYPE_WIDGET_2X = 0; + // 常量：4x4的widget类型 + public static final int TYPE_WIDGET_4X = 1; public static class DataConstants { + // 常量：笔记的MIME type public static final String NOTE = TextNote.CONTENT_ITEM_TYPE; + // 常量：通话记录的MIME type public static final String CALL_NOTE = CallNote.CONTENT_ITEM_TYPE; } /** - * Uri to query all notes and folders + * 查询所有笔记和文件夹的Uri */ public static final Uri CONTENT_NOTE_URI = Uri.parse("content://" + AUTHORITY + "/note"); /** - * Uri to query data + * 查询数据的Uri */ public static final Uri CONTENT_DATA_URI = Uri.parse("content://" + AUTHORITY + "/data"); public interface NoteColumns { /** - * The unique ID for a row - *

Type: INTEGER (long)

+ * 行的唯一ID + *

类型：INTEGER (long)

*/ public static final String ID = "_id"; /** - * The parent's id for note or folder - *

Type: INTEGER (long)

+ * 笔记或文件夹的父ID + *

类型：INTEGER (long)

*/ public static final String PARENT_ID = "parent_id"; /** - * Created data for note or folder - *

Type: INTEGER (long)

+ * 笔记或文件夹的创建日期 + *

类型：INTEGER (long)

*/ public static final String CREATED_DATE = "created_date"; /** - * Latest modified date - *

Type: INTEGER (long)

+ * 最后修改日期 + *

类型：INTEGER (long)

*/ public static final String MODIFIED_DATE = "modified_date"; /** - * Alert date - *

Type: INTEGER (long)

+ * 提醒日期 + *

类型：INTEGER (long)

*/ public static final String ALERTED_DATE = "alert_date"; /** - * Folder's name or text content of note - *

Type: TEXT

+ * 文件夹名称或笔记的文本内容 + *

类型：TEXT

*/ public static final String SNIPPET = "snippet"; /** - * Note's widget id - *

Type: INTEGER (long)

+ * 笔记的widget id + *

类型：INTEGER (long)

*/ public static final String WIDGET_ID = "widget_id"; /** - * Note's widget type - *

Type: INTEGER (long)

+ * 笔记的widget类型 + *

类型：INTEGER (long)

*/ public static final String WIDGET_TYPE = "widget_type"; /** - * Note's background color's id - *

Type: INTEGER (long)

+ * 笔记的背景颜色id + *

类型：INTEGER (long)

*/ public static final String BG_COLOR_ID = "bg_color_id"; /** - * For text note, it doesn't has attachment, for multi-media - * note, it has at least one attachment - *

Type: INTEGER

+ * 对于文本笔记，它没有附件；对于多媒体笔记，它至少有一个附件 + *

类型：INTEGER

*/ public static final String HAS_ATTACHMENT = "has_attachment"; /** - * Folder's count of notes - *

Type: INTEGER (long)

+ * 文件夹中的笔记计数 + *

类型：INTEGER (long)

*/ public static final String NOTES_COUNT = "notes_count"; /** - * The file type: folder or note - *

Type: INTEGER

+ * 文件类型：文件夹或笔记 + *

类型：INTEGER

*/ public static final String TYPE = "type"; /** - * The last sync id - *

Type: INTEGER (long)

+ * 上一次同步的ID + *

类型：INTEGER (long)

*/ public static final String SYNC_ID = "sync_id"; /** - * Sign to indicate local modified or not - *

Type: INTEGER

+ * 标识是否在本地修改 + *

类型：INTEGER

*/ public static final String LOCAL_MODIFIED = "local_modified"; /** - * Original parent id before moving into temporary folder - *

Type : INTEGER

+ * 移动到临时文件夹之前的原始父ID + *

类型：INTEGER

*/ public static final String ORIGIN_PARENT_ID = "origin_parent_id"; /** - * The gtask id - *

Type : TEXT

+ * Gtask ID + *

类型：TEXT

*/ public static final String GTASK_ID = "gtask_id"; /** - * The version code - *

Type : INTEGER (long)

+ * 版本号 + *

类型：INTEGER (long)

*/ public static final String VERSION = "version"; } public interface DataColumns { /** - * The unique ID for a row - *

Type: INTEGER (long)

+ * 行的唯一ID + *

类型：INTEGER (long)

*/ public static final String ID = "_id"; /** - * The MIME type of the item represented by this row. - *

Type: Text

+ * 此行代表的项的MIME类型 + *

类型：TEXT

*/ public static final String MIME_TYPE = "mime_type"; /** - * The reference id to note that this data belongs to - *

Type: INTEGER (long)

+ * 引用此数据所属的笔记的ID + *

类型：INTEGER (long)

*/ public static final String NOTE_ID = "note_id"; /** - * Created data for note or folder - *

Type: INTEGER (long)

+ * 笔记或文件夹的创建日期 + *

类型：INTEGER (long)

*/ public static final String CREATED_DATE = "created_date"; /** - * Latest modified date - *

Type: INTEGER (long)

+ * 最后修改日期 + *

类型：INTEGER (long)

*/ public static final String MODIFIED_DATE = "modified_date"; /** - * Data's content - *

Type: TEXT

+ * 数据内容 + *

类型：TEXT

*/ public static final String CONTENT = "content"; /** - * Generic data column, the meaning is {@link #MIMETYPE} specific, used for - * integer data type - *

Type: INTEGER

+ * 通用数据列，其含义由{@link #MIMETYPE}指定，用于整数数据类型 + *

类型：INTEGER

*/ public static final String DATA1 = "data1"; /** - * Generic data column, the meaning is {@link #MIMETYPE} specific, used for - * integer data type - *

Type: INTEGER

+ * 通用数据列，其含义由{@link #MIMETYPE}指定，用于整数数据类型 + *

类型：INTEGER

*/ public static final String DATA2 = "data2"; /** - * Generic data column, the meaning is {@link #MIMETYPE} specific, used for - * TEXT data type - *

Type: TEXT

+ * 通用数据列，其含义由{@link #MIMETYPE}指定，用于TEXT数据类型 + *

类型：TEXT

*/ public static final String DATA3 = "data3"; /** - * Generic data column, the meaning is {@link #MIMETYPE} specific, used for - * TEXT data type - *

Type: TEXT

+ * 通用数据列，其含义由{@link #MIMETYPE}指定，用于TEXT数据类型 + *

类型：TEXT

*/ public static final String DATA4 = "data4"; /** - * Generic data column, the meaning is {@link #MIMETYPE} specific, used for - * TEXT data type - *

Type: TEXT

+ * 通用数据列，其含义由{@link #MIMETYPE}指定，用于TEXT数据类型 + *

类型：TEXT

*/ public static final String DATA5 = "data5"; } + public static final class TextNote implements DataColumns { /** - * Mode to indicate the text in check list mode or not - *

Type: Integer 1:check list mode 0: normal mode

+ * 笔记在勾选列表模式下或正常模式下的标识 + *

数据类型: Integer 1:check list mode 0: normal mode

*/ public static final String MODE = DATA1; @@ -263,17 +275,18 @@ public class Notes { *

Type: INTEGER (long)

*/ public static final String CALL_DATE = DATA1; - + /** * Phone number for this record *

Type: TEXT

*/ public static final String PHONE_NUMBER = DATA3; - + public static final String CONTENT_TYPE = "vnd.android.cursor.dir/call_note"; - + public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/call_note"; - + public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/call_note"); - } + }//电话内容的数据结构 } + diff --git a/src/data/NotesDatabaseHelper.java b/src/data/NotesDatabaseHelper.java index ffe5d57..60865bb 100644 --- a/src/data/NotesDatabaseHelper.java +++ b/src/data/NotesDatabaseHelper.java @@ -15,33 +15,33 @@ */ package net.micode.notes.data; - -import android.content.ContentValues; -import android.content.Context; -import android.database.sqlite.SQLiteDatabase; -import android.database.sqlite.SQLiteOpenHelper; + +import android.content.ContentValues;//就是用于保存一些数据（string boolean byte double float int long short ...）信息，这些信息可以被数据库操作时使用。 +import android.content.Context;//加载和访问资源。（android中主要是这两个功能，但是这里具体不清楚） +import android.database.sqlite.SQLiteDatabase;//主要提供了对应于添加、删除、更新、查询的操作方法： insert()、delete()、update()和query()。配合content.values +import android.database.sqlite.SQLiteOpenHelper;//用来管理数据的创建和版本更新 import android.util.Log; - + import net.micode.notes.data.Notes.DataColumns; import net.micode.notes.data.Notes.DataConstants; import net.micode.notes.data.Notes.NoteColumns; - - +//数据库操作，用SQLOpenhelper,对一些note和文件进行数据库的操作，比如删除文件后，将文件里的note也相应删除 + public class NotesDatabaseHelper extends SQLiteOpenHelper { private static final String DB_NAME = "note.db"; - + private static final int DB_VERSION = 4; - - public interface TABLE { + + public interface TABLE { //接口，分成note和data，在后面的程序里分别使用过 public static final String NOTE = "note"; - + public static final String DATA = "data"; } - + private static final String TAG = "NotesDatabaseHelper"; - + private static NotesDatabaseHelper mInstance; - + private static final String CREATE_NOTE_TABLE_SQL = "CREATE TABLE " + TABLE.NOTE + "(" + NoteColumns.ID + " INTEGER PRIMARY KEY," + @@ -61,8 +61,8 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," + NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," + NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" + - ")"; - + ")";//数据库中需要存储的项目的名称，就相当于创建一个表格的表头的内容。 + private static final String CREATE_DATA_TABLE_SQL = "CREATE TABLE " + TABLE.DATA + "(" + DataColumns.ID + " INTEGER PRIMARY KEY," + @@ -76,12 +76,12 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," + DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," + DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" + - ")"; - + ")";//和上面的功能一样，主要是存储的项目不同 + private static final String CREATE_DATA_NOTE_ID_INDEX_SQL = "CREATE INDEX IF NOT EXISTS note_id_index ON " + - TABLE.DATA + "(" + DataColumns.NOTE_ID + ");"; - + TABLE.DATA + "(" + DataColumns.NOTE_ID + ");";//存储便签编号的一个数据表格 + /** * Increase folder's note count when move note to the folder */ @@ -92,8 +92,8 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " UPDATE " + TABLE.NOTE + " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" + " WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" + - " END"; - + " END";//在文件夹中移入一个Note之后需要更改的数据的表格。 + /** * Decrease folder's note count when move note from folder */ @@ -105,8 +105,8 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" + " WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID + " AND " + NoteColumns.NOTES_COUNT + ">0" + ";" + - " END"; - + " END";//在文件夹中移出一个Note之后需要更改的数据的表格。 + /** * Increase folder's note count when insert new note to the folder */ @@ -117,8 +117,8 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " UPDATE " + TABLE.NOTE + " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" + " WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" + - " END"; - + " END";//在文件夹中插入一个Note之后需要更改的数据的表格。 + /** * Decrease folder's note count when delete note from the folder */ @@ -130,8 +130,8 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" + " WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID + " AND " + NoteColumns.NOTES_COUNT + ">0;" + - " END"; - + " END";//在文件夹中删除一个Note之后需要更改的数据的表格。 + /** * Update note's content when insert data with type {@link DataConstants#NOTE} */ @@ -143,8 +143,8 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " UPDATE " + TABLE.NOTE + " SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT + " WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" + - " END"; - + " END";//在文件夹中对一个Note导入新的数据之后需要更改的数据的表格。 + /** * Update note's content when data with {@link DataConstants#NOTE} type has changed */ @@ -156,8 +156,8 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " UPDATE " + TABLE.NOTE + " SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT + " WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" + - " END"; - + " END";//Note数据被修改后需要更改的数据的表格。 + /** * Update note's content when data with {@link DataConstants#NOTE} type has deleted */ @@ -169,8 +169,8 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " UPDATE " + TABLE.NOTE + " SET " + NoteColumns.SNIPPET + "=''" + " WHERE " + NoteColumns.ID + "=old." + DataColumns.NOTE_ID + ";" + - " END"; - + " END";//Note数据被删除后需要更改的数据的表格。 + /** * Delete datas belong to note which has been deleted */ @@ -180,8 +180,8 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " BEGIN" + " DELETE FROM " + TABLE.DATA + " WHERE " + DataColumns.NOTE_ID + "=old." + NoteColumns.ID + ";" + - " END"; - + " END";//删除已删除的便签的数据后需要更改的数据的表格。 + /** * Delete notes belong to folder which has been deleted */ @@ -191,8 +191,8 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " BEGIN" + " DELETE FROM " + TABLE.NOTE + " WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" + - " END"; - + " END";//删除已删除的文件夹的便签后需要更改的数据的表格。 + /** * Move notes belong to folder which has been moved to trash folder */ @@ -204,19 +204,19 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " UPDATE " + TABLE.NOTE + " SET " + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER + " WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" + - " END"; - + " END";//还原垃圾桶中便签后需要更改的数据的表格。 + public NotesDatabaseHelper(Context context) { super(context, DB_NAME, null, DB_VERSION); - } - + }//构造函数，传入数据库的名称和版本 + public void createNoteTable(SQLiteDatabase db) { db.execSQL(CREATE_NOTE_TABLE_SQL); reCreateNoteTableTriggers(db); createSystemFolder(db); Log.d(TAG, "note table has been created"); - } - + }//创建表格（用来存储标签属性） + private void reCreateNoteTableTriggers(SQLiteDatabase db) { db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_update"); db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_update"); @@ -225,7 +225,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_insert"); db.execSQL("DROP TRIGGER IF EXISTS folder_delete_notes_on_delete"); db.execSQL("DROP TRIGGER IF EXISTS folder_move_notes_on_trash"); - + db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER); db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER); db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER); @@ -233,18 +233,19 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER); db.execSQL(FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER); db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER); - } - + }//execSQL是数据库操作的API，主要是更改行为的SQL语句。 + //在这里主要是用来重新创建上述定义的表格用的，先删除原来有的数据库的触发器再重新创建新的数据库 + private void createSystemFolder(SQLiteDatabase db) { ContentValues values = new ContentValues(); - + /** * call record foler for call notes */ values.put(NoteColumns.ID, Notes.ID_CALL_RECORD_FOLDER); values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); db.insert(TABLE.NOTE, null, values); - + /** * root folder which is default folder */ @@ -252,7 +253,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { values.put(NoteColumns.ID, Notes.ID_ROOT_FOLDER); values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); db.insert(TABLE.NOTE, null, values); - + /** * temporary folder which is used for moving note */ @@ -260,7 +261,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER); values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); db.insert(TABLE.NOTE, null, values); - + /** * create trash folder */ @@ -268,78 +269,80 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER); values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); db.insert(TABLE.NOTE, null, values); - } - + }//创建几个系统文件夹 + public void createDataTable(SQLiteDatabase db) { db.execSQL(CREATE_DATA_TABLE_SQL); reCreateDataTableTriggers(db); db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL); Log.d(TAG, "data table has been created"); - } - + }//创建表格（用来存储标签内容） + private void reCreateDataTableTriggers(SQLiteDatabase db) { db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_insert"); db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_update"); db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_delete"); - + db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER); db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER); db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER); - } - + }//同上面的execSQL + static synchronized NotesDatabaseHelper getInstance(Context context) { if (mInstance == null) { mInstance = new NotesDatabaseHelper(context); } return mInstance; - } - + }//上网查是为解决同一时刻只能有一个线程执行. + //在写程序库代码时，有时有一个类需要被所有的其它类使用， + //但又要求这个类只能被实例化一次，是个服务类，定义一次，其它类使用同一个这个类的实例 + @Override public void onCreate(SQLiteDatabase db) { createNoteTable(db); createDataTable(db); - } - + }//实现两个表格（上面创建的两个表格） + @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { boolean reCreateTriggers = false; boolean skipV2 = false; - + if (oldVersion == 1) { upgradeToV2(db); skipV2 = true; // this upgrade including the upgrade from v2 to v3 oldVersion++; } - + if (oldVersion == 2 && !skipV2) { upgradeToV3(db); reCreateTriggers = true; oldVersion++; } - + if (oldVersion == 3) { upgradeToV4(db); oldVersion++; } - + if (reCreateTriggers) { reCreateNoteTableTriggers(db); reCreateDataTableTriggers(db); } - + if (oldVersion != newVersion) { throw new IllegalStateException("Upgrade notes database to version " + newVersion + "fails"); } - } - + }//数据库版本的更新（数据库内容的更改） + private void upgradeToV2(SQLiteDatabase db) { db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE); db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA); createNoteTable(db); createDataTable(db); - } - + }//更新到V2版本 + private void upgradeToV3(SQLiteDatabase db) { // drop unused triggers db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_insert"); @@ -353,10 +356,10 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER); values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); db.insert(TABLE.NOTE, null, values); - } - + }//更新到V3版本 + private void upgradeToV4(SQLiteDatabase db) { db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0"); - } + }//更新到V4版本,但是不知道V2、V3、V4是什么意思 } diff --git a/src/data/NotesProvider.java b/src/data/NotesProvider.java index edb0a60..1ed1bd8 100644 --- a/src/data/NotesProvider.java +++ b/src/data/NotesProvider.java @@ -15,8 +15,7 @@ */ package net.micode.notes.data; - - + import android.app.SearchManager; import android.content.ContentProvider; import android.content.ContentUris; @@ -28,30 +27,38 @@ import android.database.sqlite.SQLiteDatabase; import android.net.Uri; import android.text.TextUtils; import android.util.Log; - + import net.micode.notes.R; import net.micode.notes.data.Notes.DataColumns; import net.micode.notes.data.Notes.NoteColumns; import net.micode.notes.data.NotesDatabaseHelper.TABLE; - - +//为存储和获取数据提供接口。可以在不同的应用程序之间共享数据 +//ContentProvider提供的方法 +//query：查询 +//insert：插入 +//update：更新 +//delete：删除 +//getType：得到数据类型 public class NotesProvider extends ContentProvider { + // UriMatcher用于匹配Uri private static final UriMatcher mMatcher; - + private NotesDatabaseHelper mHelper; - + private static final String TAG = "NotesProvider"; - + private static final int URI_NOTE = 1; private static final int URI_NOTE_ITEM = 2; private static final int URI_DATA = 3; private static final int URI_DATA_ITEM = 4; - + private static final int URI_SEARCH = 5; private static final int URI_SEARCH_SUGGEST = 6; - + static { + // 创建UriMatcher时，调用UriMatcher(UriMatcher.NO_MATCH)表示不匹配任何路径的返回码 mMatcher = new UriMatcher(UriMatcher.NO_MATCH); + // 把需要匹配Uri路径全部给注册上 mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE); mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM); mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA); @@ -60,11 +67,12 @@ public class NotesProvider extends ContentProvider { mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST); mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST); } - + /** * x'0A' represents the '\n' character in sqlite. For title and content in the search result, * we will trim '\n' and white space in order to show more information. */ + // 声明 NOTES_SEARCH_PROJECTION private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + "," + NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + "," + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + "," @@ -72,26 +80,32 @@ public class NotesProvider extends ContentProvider { + R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + "," + "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + "," + "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA; - + // 声明NOTES_SNIPPET_SEARCH_QUERY private static String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION + " FROM " + TABLE.NOTE + " WHERE " + NoteColumns.SNIPPET + " LIKE ?" + " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER + " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE; - + @Override + // Context只有在onCreate()中才被初始化 + // 对mHelper进行实例化 public boolean onCreate() { mHelper = NotesDatabaseHelper.getInstance(getContext()); return true; } - + @Override + // 查询uri在数据库中对应的位置 public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) { Cursor c = null; + // 获取可读数据库 SQLiteDatabase db = mHelper.getReadableDatabase(); String id = null; + // 匹配查找uri switch (mMatcher.match(uri)) { + // 对于不同的匹配值，在数据库中查找相应的条目 case URI_NOTE: c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null, sortOrder); @@ -113,23 +127,26 @@ public class NotesProvider extends ContentProvider { case URI_SEARCH: case URI_SEARCH_SUGGEST: if (sortOrder != null || projection != null) { + // 不合法的参数异常 throw new IllegalArgumentException( "do not specify sortOrder, selection, selectionArgs, or projection" + "with this query"); } - + String searchString = null; if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) { if (uri.getPathSegments().size() > 1) { + // getPathSegments()方法得到一个String的List， + // 在uri.getPathSegments().get(1)为第2个元素 searchString = uri.getPathSegments().get(1); } } else { searchString = uri.getQueryParameter("pattern"); } - + if (TextUtils.isEmpty(searchString)) { return null; } - + try { searchString = String.format("%%%s%%", searchString); c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY, @@ -139,6 +156,7 @@ public class NotesProvider extends ContentProvider { } break; default: + // 抛出异常 throw new IllegalArgumentException("Unknown URI " + uri); } if (c != null) { @@ -146,15 +164,19 @@ public class NotesProvider extends ContentProvider { } return c; } - + @Override + // 插入一个uri public Uri insert(Uri uri, ContentValues values) { + // 获得可写的数据库 SQLiteDatabase db = mHelper.getWritableDatabase(); long dataId = 0, noteId = 0, insertedId = 0; switch (mMatcher.match(uri)) { + // 新增一个条目 case URI_NOTE: insertedId = noteId = db.insert(TABLE.NOTE, null, values); break; + // 如果存在，查找NOTE_ID case URI_DATA: if (values.containsKey(DataColumns.NOTE_ID)) { noteId = values.getAsLong(DataColumns.NOTE_ID); @@ -163,28 +185,33 @@ public class NotesProvider extends ContentProvider { } insertedId = dataId = db.insert(TABLE.DATA, null, values); break; - default: + default: throw new IllegalArgumentException("Unknown URI " + uri); } // Notify the note uri + // notifyChange获得一个ContextResolver对象并且更新里面的内容 if (noteId > 0) { getContext().getContentResolver().notifyChange( ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null); } - + // Notify the data uri if (dataId > 0) { getContext().getContentResolver().notifyChange( ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null); } - + + // 返回插入的uri的路径 return ContentUris.withAppendedId(uri, insertedId); } - + @Override + // 删除一个uri public int delete(Uri uri, String selection, String[] selectionArgs) { + //Uri代表要操作的数据，Android上可用的每种资源 -包括 图像、视频片段、音频资源等都可以用Uri来表示。 int count = 0; String id = null; + // 获得可写的数据库 SQLiteDatabase db = mHelper.getWritableDatabase(); boolean deleteData = false; switch (mMatcher.match(uri)) { @@ -226,8 +253,9 @@ public class NotesProvider extends ContentProvider { } return count; } - + @Override + // 更新一个uri public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { int count = 0; String id = null; @@ -257,7 +285,7 @@ public class NotesProvider extends ContentProvider { default: throw new IllegalArgumentException("Unknown URI " + uri); } - + if (count > 0) { if (updateData) { getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null); @@ -266,11 +294,13 @@ public class NotesProvider extends ContentProvider { } return count; } - + + // 将字符串解析成规定格式 private String parseSelection(String selection) { return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : ""); } - + + //增加一个noteVersion private void increaseNoteVersion(long id, String selection, String[] selectionArgs) { StringBuilder sql = new StringBuilder(120); sql.append("UPDATE "); @@ -278,7 +308,7 @@ public class NotesProvider extends ContentProvider { sql.append(" SET "); sql.append(NoteColumns.VERSION); sql.append("=" + NoteColumns.VERSION + "+1 "); - + if (id > 0 || !TextUtils.isEmpty(selection)) { sql.append(" WHERE "); } @@ -292,14 +322,15 @@ public class NotesProvider extends ContentProvider { } sql.append(selectString); } - + + // execSQL()方法可以执行insert、delete、update和CREATE TABLE之类有更改行为的SQL语句 mHelper.getWritableDatabase().execSQL(sql.toString()); } - + @Override public String getType(Uri uri) { // TODO Auto-generated method stub return null; } - -} + +} \ No newline at end of file